We present a new set of multi-million particle SPH simulations of the formation of disk dominated galaxies in a cosmological context .
Some of these galaxies are higher resolution versions of the models already described in Governato et al ( 2007 ) .
To correctly compare simulations with observations we create artificial images of our simulations and from them measure photometric Bulge to Disk ( B/D ) ratios and disk scale lengths .
We show how feedback and high force and mass resolution are necessary ingredients to form galaxies that have flatter rotation curves , larger I band disk scale lengths and smaller B/D ratios .
A new simulated disk galaxy has an I-band disk scale length of 9.2 kpc and a B/D flux ratio of 0.64 ( face on , dust reddened ) .